<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片区域 -->
        <el-card>
            <el-alert type="info" title="添加商品" show-icon center :closable="false"></el-alert>
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-position="top">
                <el-tabs v-model="activeIndex" tab-position="left" @tab-click="handleTabClick" :before-leave="tabLeave">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input type="number" v-model="addForm.goods_price"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input type="number" v-model="addForm.goods_weight"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input type="number" v-model="addForm.goods_number"></el-input>
                        </el-form-item>
                        <el-form-item label="参数" prop="goods_cat">
                            <el-cascader v-model="addForm.goods_cat" :options="cateList" :props="cateProps" @change="cateSelectChange"></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <el-upload
                            :action="uploadURL"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            :headers="headerObj"
                            :on-success="handleSuccess"
                            list-type="picture"
                        >
                            <el-button size="small" type="primary">点击上传</el-button>
                            <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <el-button type="primary" class="submitCateBtn" @click="submitCate">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览 -->
        <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
            <img :src="previewPath" alt="" width="100%">
        </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'

export default {
    data() {
        return {
            // 控制步骤条和标签页
            activeIndex: '0',
            // 添加商品的表单数据
            addForm: {
                goods_name: '',
                goods_price: '',
                goods_weight: '',
                goods_number: '',
                goods_cat: [],
                pics: [], // 图片的数组
                goods_introduce: '',
                attrs: []
            },
            // 添加商品的表单数据验证规则
            addFormRules: {
                goods_name: [
                    { required: true, message: '此选项必填', trigger: 'blur' }
                ],
                goods_price: [
                    { required: true, message: '此选项必填', trigger: 'blur' }
                ],
                goods_weight: [
                    { required: true, message: '此选项必填', trigger: 'blur' }
                ],
                goods_number: [
                    { required: true, message: '此选项必填', trigger: 'blur' }
                ],
                goods_cat: [
                    { required: true, message: '此选项必填', trigger: 'blur' }
                ]
            },
            // 商品列表
            cateList: [],
            // 商品的级联选择器配置
            cateProps: {
                expandTrigger: 'hover',
                label: 'cat_name',
                value: 'cat_id',
                children: 'children'
            },
            // 动态参数数据
            manyTableData: [],
            // 静态参数数据
            onlyTableData: [],
            // 上传图片的URL地址
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传组件的headers请求头对象
            headerObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            previewPath: '',
            previewVisible: false
        }
    },
    created() {
        this.getCateList();
    },
    methods: {
        // tab 标签页点击事件
        async handleTabClick() {
            if(this.activeIndex === '1') {
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                    params: { sel: 'many' }
                });

                if(res.meta.status !== 200) {
                    return this.$message.error(res.meta.msg);
                }

                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : [];
                });

                this.$message.success(res.meta.msg);
                this.manyTableData = res.data;
            } else if(this.activeIndex === '2') {
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                    params: { sel: 'only' }
                });

                if(res.meta.status !== 200) {
                    return this.$message.error(res.meta.msg);
                }

                this.$message.success(res.meta.msg);
                this.onlyTableData = res.data;
                console.log(res);
            }
        },
        // tab 标签页切换
        tabLeave(newTab, oldTab) {
            console.log('newTab', newTab);
            console.log('oldTab', oldTab);
            if(oldTab === '0' && this.addForm.goods_cat.length !== 3) {
                this.$message.error('请先选择商品分类！');
                return false;
            }
        },
        // 获取商品列表
        async getCateList() {
            const { data: res } = await this.$http.get('categories');

            if(res.meta.status !== 200) {
                return this.$message.error(res.meta.msg);
            }

            this.$message.success(res.meta.msg);
            this.cateList = res.data;
        },
        // 监听级联选择器值 change 事件
        cateSelectChange(goods_cat) {
            if(goods_cat.length !== 3) {
                this.addForm.goods_cat = [];
                return;
            }
        },
        // 上传图片成功
        handleSuccess(response) {
            console.log(response.data.tmp_path)
            this.addForm.pics.push({ pic: response.data.tmp_path });
            console.log(this.addForm.pics)
        },
        // 删除图片
        handleRemove(res) {
            const filePath = res.response.data.tmp_path;
            console.log(filePath);
            const index = this.addForm.pics.findIndex(x => x.pic === filePath);
            this.addForm.pics.splice(index, 1);
        },
        // 图片预览
        handlePreview(res) {
            this.previewPath = res.response.data.url;
            console.log(res.response.data.url);
            this.previewVisible = true;
        },
        // 添加商品
        submitCate() {
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return;
                const form = _.cloneDeep(this.addForm);
                form.goods_cat = form.goods_cat.join(',');
                // 处理动态参数
                this.manyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(' ')
                    }
                    this.addForm.attrs.push(newInfo);
                });
                // 处理静态属性
                this.onlyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo);
                });
                form.attrs = this.addForm.attrs;

                const { data: res } = await this.$http.post('goods', form);

                if(res.meta.status !== 201) {
                    return this.$message.error(res.meta.msg);
                }

                this.$message.success(res.meta.msg);
                this.$router.push('/goods');
            });
        }
    },
    computed: {
        cateId() {
            if(this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2];
            }
            return null;
        }
    }
}
</script>

<style lang="less">
.ql-editor {
    min-height: 300px;
}
.submitCateBtn {
    margin-top: 15px!important;
}
</style>